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Sputum Exam for Acid-Fast Bacilli - Sputum Exam for Mycobacteria
Overview & Description
This test detects a bacteria called Mycobacterium in a sample of sputum.
Who is a candidate for the test?
This test is done when tuberculosis or another kind of lung infection with Mycobacteria is suspected.
How is the test performed?
The test is performed on a sample of sputum, or deep phlegm. The person must cough hard repeatedly to get the sputum up from the bottom of the lungs. When the sputum is in the throat and mouth, the person spits it into a container. In the lab, the sputum is placed on a microscope slide, stained, heated, and treated with acid. If Mycobacteria are seen, the sputum may be put on a culture dish to see if more organisms can be grown.
Preparation & Expectations
What is involved in preparation for the test?
The healthcare provider will provide specific instructions.
Results and Values
What do the test results mean?
Normally, no Mycobacteria are observed. If the test is positive, the cause of the lung infection is Mycobacteria.
Attribution
Author:David T. Moran, MD
Date Written:
Editor:Duff, Ellen, BA
Edit Date:04/11/00
Reviewer:Adam Brochert, MD
Date Reviewed:09/04/01